The silvery mole rat (Heliophobius argenteocinereus), also known as the silky mole rat or silvery blesmol, is a mole rat that appears in many areas of Africa including southern Kenya, central Malawi and Mozambique, parts of southeastern Zaire, and throughout Tanzania. The only subspecies listed under the genus Heliophobius, the silvery mole rat is an unsociable animal, and very aggressive....

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pawl

A pivoted catch designed to fall into a notch on a ratchet wheel so as to allow movement in only one direction (e.g. on a windlass or in a clock mechanism), or alternatively to move the wheel in one direction.